Question

Diket = f(2x) = 8x-9
g (3x+1) = 6x+3
tentukan rumus (f+g) (x)

Answer 1

F(2x) =8x-9
misalkan y =2x....x =1/2 y
f(y) =8(1/2 y)-9
=4y-9
f(x) =4x-9
g(3x+1) =6x+3
misalkan y =3x+1
3x =y-1
x=1/3 (y-1)
jadi
g(y) =6(1/3 (y-1) +3
=2y+1
g(x) =2x+1...f(x) =4x-9
f+g (x) =6x-8